I created an STL model in 3DSmax, shelled it in meshlab, repaired it in netfabb, and uploaded it to Shapeways. The dimensions of the object appeared constant (about 5cm tall) throughout the process, but after the upload/verification by Shapeways, the dimensions changed considerably.

For reference, here are the actual dimensions reported by the various apps (all on the same STL file):

The Meshlab measuring tool confirmed it's about 5 cm tall as well. Everyone but Shapeways seems to agree with that. What's going on here and, more importantly, how tall with my model actually be when printed?